#Bash 的 numfmt 命令
numfmt [OPTION]... [NUMBER]...
功能
数值和字符串之间的转换。
类型
可执行文件（/usr/bin/numfmt），属于 coreutils。
参数
OPTION选项：--debug- 对无效输入打印警告-d,--delimiter=X- 使用X代替空格作为分隔符--field=FIELDS- 替换FIELDS指定的 字段（默认为 1）中的数字--format=FORMAT- 使用 printf 风格的浮点数格式--from=UNIT- 指定输入的 单位格式 为UNIT--from-unit=N- 指定输入的单位大小为N；使用此选项但不指定N时默认为 1--grouping- 使用区域定义的数值分组；例如 1,000,000--header[=N]- 开头N行直接打印，不转换；默认为 1--invalid=MODE- 无效数值的处理模式：abort- 中断（默认）fail- 失败warn- 警告ignore- 忽略
--padding=N- 将输出对齐到N个字符--round=METHOD- 舍入方式：up- 向上取整down- 向下取整from-zero- 从零远离（默认）towards-zero- 向零靠拢nearest- 最近整数
--suffix=SUFFIX- 给输出添加后缀SUFFIX--to=UNIT- 指定输出的 单位格式 为UNIT--to-unit=N- 指定输入的单位大小为N；默认为 1-z,--zero-terminated- 以空字符（\0）作为行的结尾，而不是换行符（\n）--ignore=N- 忽略N个逻辑核心--help- 显示帮助--version- 显示版本
NUMBER- 要转换的数值
#单位格式
| 单位格式 | 说明 |
|---|---|
none | 没有单位，后缀会产生错误 |
auto | 1K = 1000, 1Ki = 1024 |
si | 1K = 1000 |
iec | 1K = 1024 |
iec-i | 1Ki = 1024 |
#字段
| 字段 | 说明 |
|---|---|
N | 第 N 个字段 |
N- | 第 N 个字段到末尾 |
N-M | 第 N 个字段到第 M 个字段 |
-M | 从开始到第 M 个字段 |
- | 所有字段 |
- 字段的开始序号是 1
#示例
$ numfmt --to=si 100000000
100M
$ numfmt --to=iec 100000000
96M
$ numfmt --from=si 32G
32000000000
$ $ numfmt --from=si 32G
32000000000
$ numfmt --to=iec --from=si 1T # 1T 硬盘的实际容量
932G
#推荐阅读
#手册
NUMFMT(1) User Commands NUMFMT(1) NAME numfmt - Convert numbers from/to human-readable strings SYNOPSIS numfmt [OPTION]... [NUMBER]... DESCRIPTION Reformat NUMBER(s), or the numbers from standard input if none are specified. Mandatory arguments to long options are mandatory for short options too. --debug print warnings about invalid input -d, --delimiter=X use X instead of whitespace for field delimiter --field=FIELDS replace the numbers in these input fields (default=1); see FIELDS below --format=FORMAT use printf style floating-point FORMAT; see FORMAT below for de‐ tails --from=UNIT auto-scale input numbers to UNITs; default is 'none'; see UNIT below --from-unit=N specify the input unit size (instead of the default 1) --grouping use locale-defined grouping of digits, e.g. 1,000,000 (which means it has no effect in the C/POSIX locale) --header[=N] print (without converting) the first N header lines; N defaults to 1 if not specified --invalid=MODE failure mode for invalid numbers: MODE can be: abort (default), fail, warn, ignore --padding=N pad the output to N characters; positive N will right-align; negative N will left-align; padding is ignored if the output is wider than N; the default is to automatically pad if a white‐ space is found --round=METHOD use METHOD for rounding when scaling; METHOD can be: up, down, from-zero (default), towards-zero, nearest --suffix=SUFFIX add SUFFIX to output numbers, and accept optional SUFFIX in in‐ put numbers --to=UNIT auto-scale output numbers to UNITs; see UNIT below --to-unit=N the output unit size (instead of the default 1) -z, --zero-terminated line delimiter is NUL, not newline --help display this help and exit --version output version information and exit UNIT options: none no auto-scaling is done; suffixes will trigger an error auto accept optional single/two letter suffix: 1K = 1000, 1Ki = 1024, 1M = 1000000, 1Mi = 1048576, si accept optional single letter suffix: 1K = 1000, 1M = 1000000, ... iec accept optional single letter suffix: 1K = 1024, 1M = 1048576, ... iec-i accept optional two-letter suffix: 1Ki = 1024, 1Mi = 1048576, ... FIELDS supports cut(1) style field ranges: N N'th field, counted from 1 N- from N'th field, to end of line N-M from N'th to M'th field (inclusive) -M from first to M'th field (inclusive) - all fields Multiple fields/ranges can be separated with commas FORMAT must be suitable for printing one floating-point argument '%f'. Optional quote (%'f) will enable --grouping (if supported by current locale). Optional width value (%10f) will pad output. Optional zero (%010f) width will zero pad the number. Optional negative values (%-10f) will left align. Optional precision (%.1f) will override the input determined precision. Exit status is 0 if all input numbers were successfully converted. By default, numfmt will stop at the first conversion error with exit sta‐ tus 2. With --invalid='fail' a warning is printed for each conversion error and the exit status is 2. With --invalid='warn' each conversion error is diagnosed, but the exit status is 0. With --invalid='ignore' conversion errors are not diagnosed and the exit status is 0. EXAMPLES $ numfmt --to=si 1000 -> "1.0K" $ numfmt --to=iec 2048 -> "2.0K" $ numfmt --to=iec-i 4096 -> "4.0Ki" $ echo 1K | numfmt --from=si -> "1000" $ echo 1K | numfmt --from=iec -> "1024" $ df -B1 | numfmt --header --field 2-4 --to=si $ ls -l | numfmt --header --field 5 --to=iec $ ls -lh | numfmt --header --field 5 --from=iec --padding=10 $ ls -lh | numfmt --header --field 5 --from=iec --format %10f AUTHOR Written by Assaf Gordon. REPORTING BUGS GNU coreutils online help: <https://www.gnu.org/software/coreutils/> Report any translation bugs to <https://translationproject.org/team/> COPYRIGHT Copyright © 2023 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO Full documentation <https://www.gnu.org/software/coreutils/numfmt> or available locally via: info '(coreutils) numfmt invocation' GNU coreutils 9.4 April 2024 NUMFMT(1)